Openmoko Bug #2180: stable-tracking: 'rxserr' UART messages

[Openmoko Public Trac]

#2180: stable-tracking: 'rxserr' UART messages
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 Reporter:  laforge          |          Owner:  openmoko-kernel         
     Type:  defect           |         Status:  new                     
 Priority:  high             |      Milestone:  FSO                     
Component:  System Software  |        Version:                          
 Severity:  major            |       Keywords:  gps s3x24xx_serial rxerr
 Haspatch:  0                |      Blockedby:                          
Estimated:                   |    Patchreview:                          
 Blocking:                   |   Reproducible:                          
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Comment(by andy):

 I looked at /dev/ttySAC0 with stty on GTA02 / FSO and the crtscts flag is
 not set on it.

 Quite aside from interrupt latencies, it should actually be impossible to
 get RX FIFO overrun as seen by the RX UART anyway, when the UART is
 dealing with the handshakes in hardware and the other side is honouring
 them.  It won't help with GPS case but that's of a different level of
 symptom if we trash the occasional RX sentence compared to destroying the
 GSM mux.

 I confirmed that if we set it, with stty -F /dev/ttyUSB0 crtscts, then the
 appropriate bit in the UART regs gets set to enable hardware management of
 RTS.

 What's the crtscts state on the glofiish ttySAC?

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Ticket URL: <https://docs.openmoko.org/trac/ticket/2180#comment:8>
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